混凝与光催化联用处理水体中的复合染料

doi:10.16085/j.issn.1000-6613.2020-0380

摘要/Abstract

摘要：

利用混凝与光催化处理酸性橙Ⅱ染料水样、碱性嫩黄O染料水样以及酸性橙Ⅱ与碱性嫩黄O复合染料水样，确定最佳的混凝剂投药量和pH。对比分析单一方法与联用技术的脱色性能，判断联用技术是否优于单一方法；并探究pH、光催化时间、盐含量、浊度等对脱色性能的影响。结果表明：不同的染料水样，所需的最佳脱色条件不同。处理复合染料水样时，混凝剂最佳投加量为920mg/L，最佳pH为6，经过120min的光催化脱色率可达到78.92%。混凝与光催化联用技术的脱色性能明显优于单一混凝法或光催化法，这与所处理的染料分子结构密切相关。较高的离子强度及浊度会降低混凝剂对染料的吸附电中和与吸附桥连能力，并对光催化剂的表面效应产生抑制，从而降低混凝与光催化联用技术的脱色性能。复合染料水样的盐含量为1200mg/L时，脱色率降幅可达36.87%；浊度为412.2NTU时，脱色率降幅为19.85%。

关键词: 混凝, 光催化, 降解, 脱色性能, 污染

Abstract:

Acid orange Ⅱ, auramine O, and their composites were treated by coagulation-photocatalysis. The optimum coagulant dosage and pH were determined. Decolorization performance of the combined technology (coagulation-photocatalysis) was compared with that of the single treatment method. The effects of pH value, photocatalytic time, salt content and turbidity on decolorization efficiency were explored. The results showed that the optimum decolorization conditions varied by specific dye. For the color removal of composite dye (acid orange Ⅱ-auramine O), the highest decolorization efficiency was 78.92% with 6 of pH, 920mg/L of coagulant, and 120min of photocatalytic degradation time. Decolorization performance of coagulation-photocatalysis was obviously better than that of coagulation or photocatalysis, which was closely related to the molecular structure of the tested dye. The high ion strength and turbidity could reduce the adsorption neutralization and adsorption bridging capacity of coagulants. Besides, the surface effect of TiO₂ was also inhibited, therefore, the decolorization performance of coagulation-photocatalysis was reduced. Decolorization efficiency was reduced by 36.87% when salt content was 1200mg/L. Additionally, decolorization efficiency was reduced by 19.85% when turbidity was 412.2NTU.

Key words: coagulation, photocatalysis, degradation, decolorization performance, pollution

中图分类号:

王元芳, 尹孟华, 钱佳丽, 耿启金, 杨金美, 陈刚. 混凝与光催化联用处理水体中的复合染料[J]. 化工进展, 2020, 39(12): 5290-5298.

Yuanfang WANG, Menghua YIN, Jiali QIAN, Qijin GENG, Jinmei YANG, Gang CHEN. Color removal of composite dye by coagulation-photocatalysis[J]. Chemical Industry and Engineering Progress, 2020, 39(12): 5290-5298.

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